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Linux/include/net/ip6_fib.h

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  1 /*
  2  *      Linux INET6 implementation 
  3  *
  4  *      Authors:
  5  *      Pedro Roque             <roque@di.fc.ul.pt>     
  6  *
  7  *      This program is free software; you can redistribute it and/or
  8  *      modify it under the terms of the GNU General Public License
  9  *      as published by the Free Software Foundation; either version
 10  *      2 of the License, or (at your option) any later version.
 11  */
 12 
 13 #ifndef _IP6_FIB_H
 14 #define _IP6_FIB_H
 15 
 16 #include <linux/ipv6_route.h>
 17 #include <linux/rtnetlink.h>
 18 #include <linux/spinlock.h>
 19 #include <net/dst.h>
 20 #include <net/flow.h>
 21 #include <net/netlink.h>
 22 #include <net/inetpeer.h>
 23 
 24 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
 25 #define FIB6_TABLE_HASHSZ 256
 26 #else
 27 #define FIB6_TABLE_HASHSZ 1
 28 #endif
 29 
 30 struct rt6_info;
 31 
 32 struct fib6_config {
 33         u32             fc_table;
 34         u32             fc_metric;
 35         int             fc_dst_len;
 36         int             fc_src_len;
 37         int             fc_ifindex;
 38         u32             fc_flags;
 39         u32             fc_protocol;
 40         u16             fc_type;        /* only 8 bits are used */
 41         u16             fc_delete_all_nh : 1,
 42                         __unused : 15;
 43 
 44         struct in6_addr fc_dst;
 45         struct in6_addr fc_src;
 46         struct in6_addr fc_prefsrc;
 47         struct in6_addr fc_gateway;
 48 
 49         unsigned long   fc_expires;
 50         struct nlattr   *fc_mx;
 51         int             fc_mx_len;
 52         int             fc_mp_len;
 53         struct nlattr   *fc_mp;
 54 
 55         struct nl_info  fc_nlinfo;
 56         struct nlattr   *fc_encap;
 57         u16             fc_encap_type;
 58 };
 59 
 60 struct fib6_node {
 61         struct fib6_node        *parent;
 62         struct fib6_node        *left;
 63         struct fib6_node        *right;
 64 #ifdef CONFIG_IPV6_SUBTREES
 65         struct fib6_node        *subtree;
 66 #endif
 67         struct rt6_info         *leaf;
 68 
 69         __u16                   fn_bit;         /* bit key */
 70         __u16                   fn_flags;
 71         int                     fn_sernum;
 72         struct rt6_info         *rr_ptr;
 73         struct rcu_head         rcu;
 74 };
 75 
 76 #ifndef CONFIG_IPV6_SUBTREES
 77 #define FIB6_SUBTREE(fn)        NULL
 78 #else
 79 #define FIB6_SUBTREE(fn)        ((fn)->subtree)
 80 #endif
 81 
 82 struct mx6_config {
 83         const u32 *mx;
 84         DECLARE_BITMAP(mx_valid, RTAX_MAX);
 85 };
 86 
 87 /*
 88  *      routing information
 89  *
 90  */
 91 
 92 struct rt6key {
 93         struct in6_addr addr;
 94         int             plen;
 95 };
 96 
 97 struct fib6_table;
 98 
 99 struct rt6_info {
100         struct dst_entry                dst;
101 
102         /*
103          * Tail elements of dst_entry (__refcnt etc.)
104          * and these elements (rarely used in hot path) are in
105          * the same cache line.
106          */
107         struct fib6_table               *rt6i_table;
108         struct fib6_node __rcu          *rt6i_node;
109 
110         struct in6_addr                 rt6i_gateway;
111 
112         /* Multipath routes:
113          * siblings is a list of rt6_info that have the the same metric/weight,
114          * destination, but not the same gateway. nsiblings is just a cache
115          * to speed up lookup.
116          */
117         struct list_head                rt6i_siblings;
118         unsigned int                    rt6i_nsiblings;
119 
120         atomic_t                        rt6i_ref;
121 
122         /* These are in a separate cache line. */
123         struct rt6key                   rt6i_dst ____cacheline_aligned_in_smp;
124         u32                             rt6i_flags;
125         struct rt6key                   rt6i_src;
126         struct rt6key                   rt6i_prefsrc;
127 
128         struct list_head                rt6i_uncached;
129         struct uncached_list            *rt6i_uncached_list;
130 
131         struct inet6_dev                *rt6i_idev;
132         struct rt6_info * __percpu      *rt6i_pcpu;
133 
134         u32                             rt6i_metric;
135         u32                             rt6i_pmtu;
136         /* more non-fragment space at head required */
137         unsigned short                  rt6i_nfheader_len;
138         u8                              rt6i_protocol;
139 };
140 
141 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
142 {
143         return ((struct rt6_info *)dst)->rt6i_idev;
144 }
145 
146 static inline void rt6_clean_expires(struct rt6_info *rt)
147 {
148         rt->rt6i_flags &= ~RTF_EXPIRES;
149         rt->dst.expires = 0;
150 }
151 
152 static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires)
153 {
154         rt->dst.expires = expires;
155         rt->rt6i_flags |= RTF_EXPIRES;
156 }
157 
158 static inline void rt6_update_expires(struct rt6_info *rt0, int timeout)
159 {
160         struct rt6_info *rt;
161 
162         for (rt = rt0; rt && !(rt->rt6i_flags & RTF_EXPIRES);
163              rt = (struct rt6_info *)rt->dst.from);
164         if (rt && rt != rt0)
165                 rt0->dst.expires = rt->dst.expires;
166 
167         dst_set_expires(&rt0->dst, timeout);
168         rt0->rt6i_flags |= RTF_EXPIRES;
169 }
170 
171 /* Function to safely get fn->sernum for passed in rt
172  * and store result in passed in cookie.
173  * Return true if we can get cookie safely
174  * Return false if not
175  */
176 static inline bool rt6_get_cookie_safe(const struct rt6_info *rt,
177                                        u32 *cookie)
178 {
179         struct fib6_node *fn;
180         bool status = false;
181 
182         rcu_read_lock();
183         fn = rcu_dereference(rt->rt6i_node);
184 
185         if (fn) {
186                 *cookie = fn->fn_sernum;
187                 status = true;
188         }
189 
190         rcu_read_unlock();
191         return status;
192 }
193 
194 static inline u32 rt6_get_cookie(const struct rt6_info *rt)
195 {
196         u32 cookie = 0;
197 
198         if (rt->rt6i_flags & RTF_PCPU ||
199             (unlikely(!list_empty(&rt->rt6i_uncached)) && rt->dst.from))
200                 rt = (struct rt6_info *)(rt->dst.from);
201 
202         rt6_get_cookie_safe(rt, &cookie);
203 
204         return cookie;
205 }
206 
207 static inline void ip6_rt_put(struct rt6_info *rt)
208 {
209         /* dst_release() accepts a NULL parameter.
210          * We rely on dst being first structure in struct rt6_info
211          */
212         BUILD_BUG_ON(offsetof(struct rt6_info, dst) != 0);
213         dst_release(&rt->dst);
214 }
215 
216 enum fib6_walk_state {
217 #ifdef CONFIG_IPV6_SUBTREES
218         FWS_S,
219 #endif
220         FWS_L,
221         FWS_R,
222         FWS_C,
223         FWS_U
224 };
225 
226 struct fib6_walker {
227         struct list_head lh;
228         struct fib6_node *root, *node;
229         struct rt6_info *leaf;
230         enum fib6_walk_state state;
231         bool prune;
232         unsigned int skip;
233         unsigned int count;
234         int (*func)(struct fib6_walker *);
235         void *args;
236 };
237 
238 struct rt6_statistics {
239         __u32           fib_nodes;
240         __u32           fib_route_nodes;
241         __u32           fib_rt_alloc;           /* permanent routes     */
242         __u32           fib_rt_entries;         /* rt entries in table  */
243         __u32           fib_rt_cache;           /* cache routes         */
244         __u32           fib_discarded_routes;
245 };
246 
247 #define RTN_TL_ROOT     0x0001
248 #define RTN_ROOT        0x0002          /* tree root node               */
249 #define RTN_RTINFO      0x0004          /* node with valid routing info */
250 
251 /*
252  *      priority levels (or metrics)
253  *
254  */
255 
256 
257 struct fib6_table {
258         struct hlist_node       tb6_hlist;
259         u32                     tb6_id;
260         rwlock_t                tb6_lock;
261         struct fib6_node        tb6_root;
262         struct inet_peer_base   tb6_peers;
263         unsigned int            flags;
264 #define RT6_TABLE_HAS_DFLT_ROUTER       BIT(0)
265 };
266 
267 #define RT6_TABLE_UNSPEC        RT_TABLE_UNSPEC
268 #define RT6_TABLE_MAIN          RT_TABLE_MAIN
269 #define RT6_TABLE_DFLT          RT6_TABLE_MAIN
270 #define RT6_TABLE_INFO          RT6_TABLE_MAIN
271 #define RT6_TABLE_PREFIX        RT6_TABLE_MAIN
272 
273 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
274 #define FIB6_TABLE_MIN          1
275 #define FIB6_TABLE_MAX          RT_TABLE_MAX
276 #define RT6_TABLE_LOCAL         RT_TABLE_LOCAL
277 #else
278 #define FIB6_TABLE_MIN          RT_TABLE_MAIN
279 #define FIB6_TABLE_MAX          FIB6_TABLE_MIN
280 #define RT6_TABLE_LOCAL         RT6_TABLE_MAIN
281 #endif
282 
283 typedef struct rt6_info *(*pol_lookup_t)(struct net *,
284                                          struct fib6_table *,
285                                          struct flowi6 *, int);
286 
287 /*
288  *      exported functions
289  */
290 
291 struct fib6_table *fib6_get_table(struct net *net, u32 id);
292 struct fib6_table *fib6_new_table(struct net *net, u32 id);
293 struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
294                                    int flags, pol_lookup_t lookup);
295 
296 struct fib6_node *fib6_lookup(struct fib6_node *root,
297                               const struct in6_addr *daddr,
298                               const struct in6_addr *saddr);
299 
300 struct fib6_node *fib6_locate(struct fib6_node *root,
301                               const struct in6_addr *daddr, int dst_len,
302                               const struct in6_addr *saddr, int src_len);
303 
304 void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *arg),
305                     void *arg);
306 
307 int fib6_add(struct fib6_node *root, struct rt6_info *rt,
308              struct nl_info *info, struct mx6_config *mxc,
309              struct netlink_ext_ack *extack);
310 int fib6_del(struct rt6_info *rt, struct nl_info *info);
311 
312 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
313                      unsigned int flags);
314 
315 void fib6_run_gc(unsigned long expires, struct net *net, bool force);
316 
317 void fib6_gc_cleanup(void);
318 
319 int fib6_init(void);
320 
321 int ipv6_route_open(struct inode *inode, struct file *file);
322 
323 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
324 int fib6_rules_init(void);
325 void fib6_rules_cleanup(void);
326 #else
327 static inline int               fib6_rules_init(void)
328 {
329         return 0;
330 }
331 static inline void              fib6_rules_cleanup(void)
332 {
333         return ;
334 }
335 #endif
336 #endif
337 

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